Thanks everyone! Due to personal reasons, we waited to book. When I went in to book, the flight for the way down had gone down in price and the flight on the way back had gone up! The net difference was $0 so it's all good.
Now I'm just going to watch for a better return flight or price because I'm really happy with the flight down. And our return flight is lower season, so it may go back down. With no change fees for southwest I'm hoping it will be easy to change if I find something better.
Thanks for all your advice, it really helped.